KR20140053938A - Method for transmitting a signal - Google Patents

Abstract

Provided is a receiving apparatus including: a basic service receiving unit which extracts a transmission stream which is provided for a basic service by demodulating and channel-decoding a signal which is received through any one broadcast channel among broadcast channels for the basic service; an additional service receiving unit which extracts a transmission stream which is provided for an additional service by demodulating and channel-decoding a signal which is received through any one broadcast channel for the additional service which is combined with the basic service; an integrated demultiplexer which performs a demultiplex about each of the transmission streams which are respectively provided for the basic service and the additional service in order to extract at least one transmission stream from the transmission stream for the basic service, the transmission stream for the additional service, and a transmission stream for service information; and a source decoder unit which decodes each of the transmission streams which are respectively provided for the demultiplexed basic service and the demultiplexed additional service in order to output a basic source and an additional source which is combined with the basic source.

Description

[0001] METHOD FOR TRANSMITTING A SIGNAL [0002]

The following embodiments relate to a transmitting and receiving apparatus and a transmitting and receiving method.

The 3DTV broadcasting technology transmits a reference image (left image) and various types of 3D additional images (right image, depth image, and the like) through a digital broadcasting network, and the 3DTV terminal receives the converted image, converts it into left and right images, Thereby realizing a stereoscopic effect. As a general method for this purpose, a side-by-side method of shortening the left and right images in one image frame and multiplexing them and broadcasting them to the existing digital broadcasting network has been widely used.

However, this method has a problem that the left and right images are simultaneously displayed in a general two-dimensional terminal. Therefore, in order to ensure complete backward compatibility, the left and right video signals are virtually transmitted through two channels, and a program identifier (PID) for distinguishing the left and right video signals from the program data indicating the stereoscopic video is added And then transmitted.

A method of adding a PID (Packet Identifier) and transmitting the same is to multiplex the left and right images into one transport stream (TS), and then broadcast the same through one RF channel. Therefore, when there is a restriction on the size of the effective data transmission rate for the RF channel, the quality of the general two-dimensional broadcast is deteriorated. In particular, in the case of ATSC digital broadcasting, the effective data transmission rate is substantially 19.36 Mbps, which causes deterioration of the overall two-dimensional broadcast service quality when the left and right images are transmitted through one RF channel.

As described above, in order to expand the broadcasting channel capacity for high-quality broadcasting service in 3DTV broadcasting, there is a desperate need for a method for solving the limitation in the case of restriction.

In an embodiment of the present invention, a plurality of supplementary services share one broadcast channel to provide a high-quality broadcast service such as 3DTV, and other broadcast channels providing a basic service cooperate simultaneously to provide an efficient high-quality service A receiving device, and a transmitting and receiving method.

In addition, in an embodiment of the present invention, in a broadcasting environment in which a transmission bit rate for an additional service such as a 3DTV broadcasting service is smaller than a bit rate for a basic service, a broadcasting channel for a basic service and a broadcasting channel for an additional service are efficiently Receiving apparatus and a transmitting and receiving method capable of interlocking with each other.

A transmitting apparatus according to an embodiment of the present invention includes at least one source encoder unit for encoding basic sources into transport streams for a base service and encoding an additional source coupled to the base sources into a transport stream for an additional service, ; At least one remultiplexer for re-multiplexing the transport streams for the basic service into a single transport stream for the basic service; An aggregated remultiplexer for re-multiplexing the transport stream for the supplementary service into a single transport stream for the supplementary service; At least one basic service transmitter for modulating and channel-encoding a single transport stream for the basic service and outputting the same through a broadcast channel for the basic service; And a supplementary service transmitter for modulating and channel-encoding a single transport stream for the supplementary service and outputting the modulated and channel-encoded broadcast channel for the supplementary service.

A receiving apparatus according to an exemplary embodiment of the present invention includes a basic service receiving unit for demodulating and channel decoding a signal received through one of broadcasting channels for a basic service and extracting a transport stream provided for the basic service; An additional service receiver for demodulating and channel decoding a signal received through a broadcast channel for an additional service coupled to the basic service and extracting a transport stream provided for the additional service; For each of a transport stream provided for the basic service and a transport stream provided for the supplementary service, for extracting at least one transport stream for a transport stream for a basic service, a transport stream for an additional service, and a transport stream for service information An integrated demultiplexer for performing demultiplexing; And a source decoder portion for decoding each of the transport stream provided for the basic service demultiplexed and the transport stream provided for the demultiplexed additional service to output an additional source coupled to the primary source or the primary source.

A transmission method according to an embodiment of the present invention includes encoding basic sources into transport streams for a base service and encoding additional sources coupled to the base sources into a transport stream for an additional service; Re-multiplexing the transport streams for the basic service into a single transport stream for the base service, and re-multiplexing the transport stream for the supplementary service into a single transport stream for the supplementary service; Modulating and channel-encoding a single transport stream for the basic service, outputting the same as a broadcast channel for the basic service, modulating and channel-encoding a single transport stream for the supplementary service, and outputting the same as a broadcast channel for the supplementary service .

A receiving method according to an embodiment of the present invention includes the steps of demodulating and channel decoding a signal received through one of the broadcast channels for a basic service and extracting a transport stream provided for the basic service; Demodulating and channel decoding a signal received through a broadcast channel for an additional service coupled to the basic service and extracting a transport stream provided for the supplementary service; For each of a transport stream provided for the basic service and a transport stream provided for the supplementary service, for extracting at least one transport stream for a transport stream for a basic service, a transport stream for an additional service, and a transport stream for service information Performing demultiplexing; And decoding each of the transport stream provided for the basic service demultiplexed and the transport stream provided for the demultiplexed additional service to output a primary source or an additional source coupled to the primary source.

According to an embodiment of the present invention, in a broadcasting environment in which a transmission bit rate for an additional service such as a 3DTV broadcasting service is smaller than a bit rate for a basic service, a broadcasting channel for a basic service and a broadcasting channel for an additional service are linked, It is possible to effectively provide the broadcasting service of the broadcasting service.

In addition, according to an embodiment of the present invention, when it is difficult to secure additional transmission capacity within a conventional broadcasting channel for 3DTV broadcasting, a separate broadcasting channel for both wired and wireless can be secured and shared by multiple operators simultaneously , It is possible to provide an effective and high-quality 3DTV broadcasting service without deteriorating existing broadcasting.

1 is a block diagram of a transmitting apparatus according to an embodiment of the present invention.
2 is a diagram illustrating a PSIP configuration according to an embodiment of the present invention.
3 is a block diagram of a receiving apparatus according to an embodiment of the present invention.
4 is a block diagram of an integrated demultiplexer in accordance with an embodiment of the present invention.
5 is a flowchart illustrating a transmission method according to an embodiment of the present invention.
6 is a flowchart illustrating a receiving method according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. In addition, the same reference numerals shown in the drawings denote the same members.

In one embodiment of the present invention, a broadcast channel is a physical transport channel provided for each broadcast service provider (or network provider), and a virtual channel is separated again in a broadcast channel to provide individual services ≪ / RTI >

1 is a block diagram of a transmitting apparatus according to an embodiment of the present invention. 1, a transmitter according to an embodiment of the present invention includes at least one source encoder 110, at least one remultiplexer 130, at least one base service transmitter 150, an integrated remultiplexer 170 and an additional service transmission unit 190.

The source encoder unit 110 encodes the basic sources into transport streams for the base service and encodes the additional source coupled to the basic sources into a transport stream for the supplementary service.

The source encoder unit 110 includes a basic source encoder 112 for encoding basic sources into transport streams for a basic service and an additional source encoder 114 for encoding additional sources coupled to basic sources into a transport stream for additional services ).

In FIG. 1, a basic source (basic source A1, basic source A2, etc.) corresponds to a general broadcast service, and is a program provided to each broadcaster to provide basic services, that is, content sources.

The primary source encoder 112 encodes content sources with a standardized codec and encodes them into video and audio, respectively, if the content source is for AV services .

The additional source encoder 114 may also operate independently of the primary source encoder 112 and may operate dependent on the use of interrelationships such as Multi-View Coding (MVC), Scalable Video Coding have.

When the primary source encoder 112 and the additional source encoder 114 operate independently in digital broadcasting such as ATSC, the basic source encoder 112 uses an MPEG-2 encoder to ensure backward compatibility, As the encoder 114, an MPEG-4 AVC encoder having a high compression efficiency can be used.

As described above, when the MPEG-2 encoder is used as the primary source encoder 112 and the MPEG-4 AVC encoder is used as the additional source encoder 114, the bit rate of the transport stream encoding the additional source is higher than that of the basic service Much smaller.

As a result, the transmitting apparatus multiplexes two additional services (the additional source A1 and the additional source B1) having a small bit rate and transmits the multiplexed service on a broadcast channel (broadcast channel D) for an additional service, A2, B1, B2) can be transmitted on a broadcast channel for the basic service (here, broadcast channels A and B).

Accordingly, the receiving apparatus or the receiving terminal corresponding to the transmitting apparatus can simultaneously receive any one of the broadcasting channels (A, B, ..) for the basic service and the broadcasting channel (D) for the additional service, Can be provided.

In one embodiment of the present invention, it is possible to provide an additional source (additional source A1, additional source B1, ..) for providing a high quality service through a separate broadcast channel D for the supplementary service. The broadcast channel D for the supplementary service may be the same as the broadcast channel A, B, .. for the basic service, or may be a heterogeneous network such as IPTV.

The primary source encoder 112 and the additional source encoder 114 may be operated by a single system time clock (STC) to provide a high quality service to the user. The basic source encoder 112 and the additional source encoder 114 use the same system time clock to generate clock reference information (e.g., PCR) synchronized with the transport streams for the basic service and the transport stream for the supplementary service, respectively, Stamps (DTS, PTS, etc.) can be inserted.

In addition, the primary source encoder 112 and the additional source encoder 114 allow the time stamps to be synchronized so that the basic service and the supplementary service can be reproduced at the same time on the receiving side. That is, for example, in the case of 3DTV, substantially the same time stamp may be inserted for each transport stream for the basic service and an access unit (AU) of the transport stream for the supplementary service so that the left and right images can be reproduced at the same time .

A descriptor for notifying a virtual channel interworking between different broadcast channels may be inserted into a transport stream for the basic service or a transport stream for the supplementary service. Descriptors for notifying virtual channels interlocked with each other will be described later with reference to FIG.

The remultiplexer 130 is for re-multiplexing the transport streams for the basic service encoding the basic sources into a single transport stream (for example, an MPEG-2 Transport Stream (TS)) for the basic service, Can be multiplexed.

The demultiplexer 130 may packetize information on a channel and information on a service into a transport stream having a specific packet ID (PID).

The basic service transmission unit 150 modulates and channel-codes a single transport stream for the basic service and outputs the same through a broadcast channel for the basic service.

Each of the basic service transmission units 150 modulates and channel-encodes a single transport stream for a basic service multiplexed for each broadcasting service provider, and generates a broadcasting channel for the basic service allocated to each broadcasting service provider (here, A, B, ).

The unified demultiplexer 170 receives the transport stream for the encoded supplementary service from the supplementary source encoder 114 of each provider and re-multiplexes the received transport stream into a single transport stream for the supplementary service. The unified demultiplexer 170 is a structure for multiplexing transmission streams for additional services and transmitting the multiplexed transport streams on one physical broadcasting channel, in which a plurality of broadcasting companies share one broadcasting channel to transmit their additional services.

The transport stream for the re-multiplexed supplementary service is channel-coded and modulated by the supplementary service transmitter 190 and then broadcast on a separate broadcast channel D for the supplementary service.

As a result, the additional source A1, the additional source B1, etc., interworking with the basic source A1, the basic source B1, .., etc. of each provider are coded by the supplementary source encoder 114 and then transmitted to a broadcasting channel (A, B) but is re-multiplexed into one single transport stream for additional services and broadcast on a separate broadcast channel (D) for additional services.

When the demultiplexer 130 and the unified demultiplexer 170 of each provider are based on the MPEG-2 system, the jitter of the PCR can be corrected in the process of re-multiplexing the respective transport streams.

However, since the single transport stream for the basic service and the single transport stream for the supplementary service re-multiplexed by the remultiplexer 130 and the unified demultiplexer 170 are generated by the same system time clock, The synchronization of the PCR between the single stream for the service and the transport stream for the corresponding supplementary service can be maintained continuously.

In digital broadcasting, detailed information on channels and services can be transmitted via Program Specific Information (PSI), or via Program Service Information Protocol (PSIP) or Service Information (SI). The detailed information about the channel and the service may be packetized into a transport stream having a specific packet ID (PID) and finally multiplexed in the remultiplexer 130 and the unified demultiplexer 170.

The supplementary service transmission unit 190 modulates and channel-encodes a single transport stream for the supplementary service and outputs the modulated and channel-encoded broadcast channel to the supplementary service.

In one embodiment of the present invention, the term " service " is used in the term " program " in some standard documents, and the service may be provided through several virtual channels within one transport stream.

FIG. 2 is a diagram illustrating a configuration of a PSIP according to an embodiment of the present invention. Referring to FIG. 2, in the case of PSIP (see ATSC standard document A / 65C), attributes of virtual channels in a transport stream are described in a VCT (Virtual Channel Table).

In one embodiment of the present invention, a descriptor such as Table 1 can be defined in the descriptor loop of the VCT of the PSIP to inform the virtual channel interworking between different broadcast channels.

        Phrase 3D_service_descriptor () {
descriptor_tag
descriptor_length
:
dependency_flag
If (dependency_flag) {
Channel_TSID
Elementary_PID
:
}

The name of the descriptor may be a 3DTV service, and may include a descriptor itself or a separate flag in a descriptor. It is possible to inform the receiving side that it is a 3DTV service.

Channel_TSIDs 220, 240, and 251 may be transport_stream_id in the PAT (Program Association Table) of the transport stream or Channel_TSID in the descriptor loop of the virtual channel of the VCT to indicate the transport stream transmitted through another interworking broadcast channel .

In the digital broadcasting, since the Chanel_TSIDs 220, 240 and 251 are given unique values for each physical broadcast channel, different physical channels can be indicated using the Channel_TSID.

The Elementary_PID (Packet IDentifier) 253 is the packet ID (PID) of the video transport stream in the interlocked virtual channel. The Elementary_PID 253 can be defined through the Service_location_descriptor of the VCT.

In the PAT and the VCT, program numbers 210 and 230 for classifying programs provided through a virtual channel can be defined.

In an embodiment of the present invention, the basic service and the supplementary service may be assigned Program_Number of the same value for recognizing as a single program, or may be assigned different Program_Number to recognize each Program_Number as an extended program.

In the case of allocating different Program_Number between the basic service and the supplementary service, it is possible to designate programs of different broadcasting channels by writing the Program_Number in addition to the Channel_TSID in the if statement of [Table 1]. If the Program_Number is the same between the two services, the program provided through the virtual channel of the other broadcast channel can be naturally directed only by the Channel_TSID even if the Program_Number is not separately written.

Another way to use Program_number in the if statement of Table 1 is to write the source_id in the VCT.

Here, since the source_id is for identifying a programming source in the virtual channel, the source between the basic service and the supplementary service can be interlocked using the source_id.

The descriptor in [Table 1] can be embedded in the transport stream for the basic service or in the transport stream for the supplementary service. In order to minimize the error of the already received receiving device, the descriptor of [Table 1] It can be inserted into the transport stream for the additional service.

In the descriptor of [Table 1], various attributes for 3D broadcasting service such as 3D image format and left / right notification can be described in addition to an indicator for channel interworking. The descriptor in Table 1 is transmitted through a descriptor loop in an event information table (EIT) describing event information such as a program title of a virtual channel, a start time of a program, And may be transmitted via a descriptor loop in another PMT (Program Map Table).

The event information table (EIT) describes event information in units of time, and thus can be used for switching between two-dimensional / three-dimensional broadcast programs on a time basis.

As described in Table 1, in order to link the basic service and the supplementary service provided through different physical broadcasting channels, the channel_TSID of the other broadcasting channel and the Elementary_PID of the video TS to be interlocked with each other in the 3D_service_descriptor Can be inserted.

2 shows a case where the Program_Number 210 of the transport stream TS (A), TS (B) and TS (C) for the basic service and the Program_Number 230 of the transport stream TS (D) Shows a case where the same Program_Number (0x00A1, 0x00B1, 0x00C1 in this case) is used and the 3D_service_descriptor 250 is inserted in the transport stream TS (D) for the additional service.

The 3D_service_descriptor 250 includes a channel_TSID 251 (0x0AA1, 0x0BB1, 0x0CC1) in the transport stream TS (A), TS (B), TS And may have an Elementary_PID value 253 (0x1F1, 0x1F2, 0x1F3) of the packet.

In the above description, two virtual channels are interlocked. However, in a more general case, when two or more channels are interlocked, a descriptor for signaling the two channels may be defined as shown in [Table 2] below.

      Phrase channel_bonding_descriptor ()
{
descriptor_tag
descriptor_length
:
service_type
num_bonding_channel
for (i = 0; i <num_bonding_channel; i ++)
channel_locator (i)
:
}

In Table 2, the descriptor_tag is a value for identifying a descriptor for describing the channel linking information. The service_type indicates a type of service provided through interworking of a broadcast channel in an embodiment of the present invention.

For example, 0x02 = TV service, 0x03 = audio service, 0x10 = 3DTV service, 0x11 = multi-view TV service, 0x20 = UHDTV (Ultra High definition TV)

That is, 3DTV service can be realized through two channel interworking. However, when a plurality of channels are interlocked, services such as multi-view TV and UHTV can be designated.

num_bonding_channel represents the number of broadcast channels for supplementary services to be linked to the broadcast channel for the basic service.

The channel_locator () is used to indicate the location of the virtual channel in the broadcast channel to be interlocked. The channel_locator () is a channel identifier for identifying the base stream in the program (e.g., ATSC DATA BROADCAST STANDARD (A90)).

1, num_bonding_channel is 1, channel_locator (0) is a broadcast channel for a basic service, and channel_locator (1) is a broadcast channel for an additional service.

On the other hand, the num_bonding_channel value can be increased for the services such as multi-view TV and UHTV.

3 is a block diagram of a receiving apparatus according to an embodiment of the present invention. 3, a receiving apparatus according to an exemplary embodiment of the present invention includes a basic service receiver 310, an additional service receiver 320, an integrated demultiplexer 330, and a source decoder unit 370. In addition, the receiving apparatus 300 according to an embodiment of the present invention may further include a service information analyzing unit 350.

The basic service receiver 310 receives basic service and demodulates and decodes a signal received through one of broadcasting channels (a broadcasting channel A, a broadcasting channel B, ..) for a basic service And extracts the transport stream provided for the basic service.

The supplementary service receiver 320 demodulates and channel-decodes a signal (here, a signal of the broadcast channel D) received through a broadcast channel for an additional service coupled to the basic service, Extract the transport stream.

The integrated demultiplexer 330 demultiplexes the transport stream for the basic service, the transport stream for the additional service, and the service information through the respective demultiplexers (the basic service demultiplexer 332 and the additional service demultiplexer 334) And performs synchronization processing of two transport streams (a transport stream for a basic service and a transport stream for an additional service) transmitted through different broadcast channels.

The integrated demultiplexer 330 is provided for the transport stream and the supplementary service provided for the basic service to extract at least one transport stream for the transport stream for the basic service, the transport stream for the additional service and the transport stream for the service information And performs demultiplexing on each transport stream.

The integrated demultiplexer 330 may perform synchronization between the transport stream provided for the basic service and the transport stream provided for the supplementary service.

In addition, the integrated demultiplexer 330 includes a basic service demultiplexer 332 for demultiplexing the transport stream provided for the basic service, and an additional service demultiplexer 332 for demultiplexing the transport stream provided for the supplementary service, (334). &Lt; / RTI &gt; The integrated demultiplexer 330 will be described in detail with reference to FIG.

The service information analyzing unit 350 analyzes the transport stream for the service information (PSIP, SI, PSI, etc.) extracted from the integrated demultiplexer 330 and transmits the broadcast channel, the virtual channel, or the service type Can be interpreted.

The information interpreted by the service information analyzing unit 350 can be displayed to the user through an electronic program guide (EPG). Therefore, the user can select the basic service or the high-quality service by the electronic program guide.

Each of the transport streams extracted through the integrated demultiplexer 330 is decoded by the source decoder unit 370.

The source decoder unit 370 decodes each of the transport stream provided for the demultiplexed basic service and the transport stream provided for the demultiplexed supplementary service, in order to output an additional source coupled to the basic source or the basic source.

The source decoder unit 370 may include independent decoding (e.g., MPEG-2, MPEG-4 AVC) or basic source decoder 372 and additional source decoder 374 between the source decoder 372 and the additional source decoder 374. [ (E.g., MVC, SVC) between the two streams.

The source decoder unit 370 can provide a basic quality service or a high quality service by a combination of a basic source and an additional source by decoding.

For example, in the case of a 3DTV broadcasting service, the basic quality of service may be two-dimensional broadcasting and the high-quality service may be three-dimensional broadcasting.

Meanwhile, in an embodiment of the present invention, in order to receive a basic quality service, only the basic service receiving unit 310 and related components can operate.

4 is a block diagram of an integrated demultiplexer in accordance with an embodiment of the present invention. 4, an integrated demultiplexer 400 according to an embodiment of the present invention includes a basic service demultiplexer 410, an additional service demultiplexer 430, and a controller 450.

The basic service demultiplexing unit 410 demultiplexes the transport stream provided for the basic service and may include a first packet filter 411, a first buffer 413 and a first packet decoder 415 have.

The first packet filter 411 may extract a transport stream for the basic service or a transport stream for the service information from the transport stream provided for the basic service.

The first packet filter 411 can extract a transport stream for the basic service from the transport stream provided for the basic service extracted through the basic service receiver 310. [ In the case of the MPEG-2 system, the first packet filter 411 uses a packet ID (PID) of a transport stream (TS) packet having a unique value for each component of each program, Can be extracted.

The first packet filter 411 extracts a packet of a specific transport stream for transmitting the PCR, sends it to a system time clock generation unit 451, extracts PSIP, SI, and PSI transmission TS packets, To the information analysis unit 350.

The first buffer 413 may temporarily store the transport stream for the basic service so that the transport stream for the basic service and the transport stream for the supplementary service are reproduced at the same time. That is, when the transport stream for the basic service is transmitted faster than the transport stream for the additional service, the first buffer 413 plays a role of waiting the transport stream for the basic service until the transport stream for the additional service is transmitted .

The first packet decoder 415 can decode the transport stream for the basic service output from the first buffer 413. [

The additional service demultiplexer 430 demultiplexes the transport stream provided for the additional service and may include a second packet filter 431, a second buffer 433 and a second packet decoder 435 have.

The second packet filter 431 may extract a transport stream for the supplementary service from the transport stream provided for the supplementary service.

The second packet filter 431 can extract a transport stream for the supplementary service from the transport stream provided for the supplementary service extracted through the supplementary service receiver. In the case of the MPEG-2 system, the second packet filter 431 extracts a transport stream (TS) for an additional service using a packet ID (PID) of a transport stream (TS) can do.

The second buffer 433 may temporarily store the transport stream for the additional service. When the transport stream for the additional service is transmitted faster than the transport stream for the basic service as in the first buffer 413, the second buffer 433 transmits the transport stream for the additional service to the transport stream for the base service To wait until it is done.

The second packet decoder 435 may decode the transport stream for the additional service output from the second buffer 433. [

The control unit 450 controls the buffers such that the outputs of the basic service demultiplexing unit 410 and the additional service demultiplexing unit 430 are made at the same time, thereby correcting the system time clock.

The control unit 450 can control whether the basic service demultiplexing unit 410 and the additional service demultiplexing unit 430 operate according to the control mode of the service.

The control unit 450 may include a system time clock generation unit 451, a buffer control unit 453, and a system time clock correction unit 455.

The system time clock generator 451 can generate a system time clock using the PCR transport stream of the basic service extracted through the first packet filter 411.

The system time clock generator 451 can generate a system time clock locked with a transmitter-side encoder using the PCR transmission stream, which is reference information of the clock (see MPEG-2 System Specification (ITU-T Rec. H.222).

In one embodiment of the present invention, the transport stream (basic service TS) for the basic service and the transport stream (additional service TS) for the supplementary service are generated by the same system time clock on the transmitting side. Therefore, the first packet filter 411 extracts the PCR transport stream only from the transport stream for the basic service, generates a system time clock, and can use the system time clock as a clock of the entire system.

Meanwhile, the transport stream for the basic service and the transport stream for the supplementary service may be generated at the same time in the source encoder unit 110, but may have different delay times in the process of being transmitted through the broadcasting network of different paths (channels) .

Therefore, in one embodiment of the present invention, the basic source decoder 372 and the additional source decoder 374 are compensated through the first and second buffers 413 and 433, the buffer control unit 453 and the system time clock correction unit 455, So that the basic service and the supplementary service can be reproduced at the same time.

The buffer control unit 453 stores the transport stream input to the two buffers (the first buffer 413 and the second buffer 433), and then transmits the transport stream through the PCR transport stream of the basic service and the second packet filter 431 And compare the PCR transport streams of the extracted supplementary services with each other to control the output timing of the transport stream for the basic service and the transport stream for the supplementary service.

That is, the buffer control unit 453 buffers the PCR transport stream of the basic service and the PCR transport stream of the supplementary service temporally preceding and delaying the PCR transport stream according to the mutual comparison result, It is possible to control the transport stream to be output at the same time.

The system time clock correcting unit 455 corrects the system time-clock corrector 455 based on the mutual comparison result of each PCR transport stream with respect to the transmission stream of the service whose transmission is delayed due to the delay in the first buffer 413 or the second buffer 433 The time clock can be corrected.

The simplest corrected system time clock can be obtained by the difference between the input system time clock and the delay time in the buffer (system time clock - buffer delay time). Here, the system time clock may be locked with the source encoder unit of the transmitting apparatus corresponding to the receiving apparatus.

The control unit 450 (more specifically, the buffer control unit 453) may receive a control mode of a basic / high-quality service that is directly input by a user or controlled by service information received from a transmission side.

If the control mode of the basic / high quality service is selected as the basic mode and instructs to output the basic service, the buffer control unit 453 operates only the blocks for providing the basic service.

When the service mode is selected as the basic mode, a synchronization process between the basic service and the supplementary service is not required, and a separate delay process is not required in the buffer. Therefore, the buffer control unit 453 transmits the transport stream for the basic service to the first buffer 413, As shown in FIG.

In the case of a 3DTV service, the basic / high quality service mode may correspond to a 2D / 3D mode for selecting a two-dimensional or three-dimensional service. Here, when switching from the 2D mode to the 3D mode or from the 3D mode to the 2D mode, the output time of the buffer may be changed and the screen may be stopped. However, since the glasses need to be worn or taken off, No problem.

If a stoppage of the screen occurs, the controller 450 may display a message to the user on the screen informing the start or end of the 3DTV service while the screen is temporarily stopped.

5 is a flowchart illustrating a transmission method according to an embodiment of the present invention.

Referring to FIG. 5, the transmitting apparatus encodes the basic sources into transport streams for the basic service, and encodes the additional source coupled to the basic sources into a transport stream for the supplementary service (510).

At this time, the transmitting apparatus may insert the synchronized clock reference information and the synchronized time stamp into the transport stream for the basic service and the transport stream for the supplementary service, respectively, using the same system time clock (520).

The transmitting apparatus re-multiplexes the transport streams for the basic service into a single transport stream for the basic service, and re-multiplexes the transport stream for the additional service into a single transport stream for the additional service (530).

The transmitting apparatus modulates and channel-codes a single transport stream for the basic service and a single transport stream for the supplementary service (540).

The transmitter outputs a single transport stream for the basic service to the broadcast channel for the basic service, and outputs a single transport stream for the supplementary service to the broadcast channel (550).

6 is a flowchart illustrating a receiving method according to an embodiment of the present invention.

Referring to FIG. 6, a receiving apparatus demodulates and decodes a signal received through one of broadcasting channels for a basic service, extracts a transport stream provided for a basic service, and at the same time, Demodulates and decodes the received signal through a broadcast channel for an additional service, and extracts a transport stream provided for the supplementary service (610).

The receiving apparatus can control the demultiplexing of the transport stream provided for the basic service and the demultiplexing of the transport stream provided for the supplementary service according to the control mode of the service.

That is, the receiving apparatus determines whether the control mode of the service is the high-quality mode (step 620). If the control mode of the service is the high-quality mode, the receiving apparatus transmits the demultiplexing for the transport stream provided for the basic service, All demultiplexing for the stream is performed (630).

If the control mode of the service is not the high-quality mode but the basic mode, the receiving apparatus performs demultiplexing only on the transport stream provided for the basic service (680), and then performs the process of 640 or less.

The receiving apparatus demultiplexes each of the transport stream provided for the basic service and the transport stream provided for the additional service, thereby generating a transport stream for the basic service, a transport stream for the additional service and a transport stream for the service information The transport stream can be extracted.

Also, the receiving apparatus may analyze the transport stream for the service information and interpret the information including the broadcast channel information, the virtual channel information, or the service type linked to each other.

The receiving apparatus can control the system time clock so that demultiplexing of the transport stream provided for the basic service and demultiplexing of the transport stream provided for the supplementary service can be performed at the same time.

The receiving apparatus can generate a system time clock using the PCR transmission stream of the basic service extracted from the first packet filter in order to control the system time clock (640).

Thereafter, the receiving apparatus compares the PCR transport stream of the basic service extracted from the first packet filter and the PCR transport stream of the additional service extracted from the second packet filter, so that the transport stream for the basic service and the transport stream for the additional service The output time point can be controlled (650).

At this time, the system time clock for the transport stream of the service whose transmission is delayed can be corrected based on the result of mutual comparison of the PCR transport stream of the basic service and the PCR transport stream of the supplementary service (660).

The receiving apparatus decodes each transport stream provided for the demultiplexed basic service and the transport stream provided for the demultiplexed supplementary service, and outputs the decoded transport stream to an additional source coupled to the basic source or the basic source (670).

The above-described methods may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

Therefore, the scope of the present invention should not be construed as being limited to the embodiments described, but should be determined by equivalents to the appended claims, as well as the appended claims.

110: source encoder section
130: demultiplexer
150: Basic service transmitter
170: Integrated re-sizer
190: Additional service transmitter

Claims (1)

Encoding the elementary stream for transmitting the basic service and encoding the additional stream for transmitting the additional service, respectively; And
And transmitting the encoded base stream on a broadcast channel and transmitting the supplementary stream on a transport channel other than the broadcast channel,
Here, the elementary stream may include interworking information for interlocking the elementary stream and the additional stream,
Wherein the elementary stream is multiplexed with synchronization information for synchronizing the elementary stream and the additional stream.

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